Unlike companies like Zynga, there have not been any huge red flags in LinkedIn's metrics. Its revenue, subscribers, unique visitors and pageviews are all growing consistently.

Companies like Groupon and Zynga are seemingly rife with drama. LinkedIn has managed to avoid the hotseat that those other companies have fallen into.

LinkedIn is essentially a stand-in for Facebook as the social media initial public offering of the year. Anticipation for Facebook is extremely high (it already has a $100 billion valuation) and any company that has a similar business model stands to absorb some of the euphoria.